A rendering shows the unit with scenes incorporating ocean waves, sharks, sea turtles, penguins, angel fish and a centerpiece of the parks' iconic Shamu, which will top out at 27 feet high. The float will be 32 feet long.

"It's actually a kind of see-through float. It's got some airiness, with a bridge on top and some space underneath it," said Dennis Wirzman, SeaWorld's vice president of entertainment "It will feel very open and under sea."

Onboard will be an celebrity performer who will be identified soon, Wirzman said. The Macy's format has a parade stop in front of the flagship store in Manhattan. There, a song will be performed for the television audience.

Walking alongside the float will be children and adults in aquatic costumes, includes some folks on stilts who will walk the 2-mile parade route.

It will be the second time SeaWorld has participated in the Macy's parade, and the first since 1986 when it featured a baby Shamu helium balloon in 1986.

“With its diverse and majestic depictions of sea creatures transformed into larger-than-life form, the A Sea of Surprises float is sure to inspire millions of children and adults to learn more about, appreciate and enjoy all forms of aquatic life,” said Amy Kule, executive producer of Macy’s Thanksgiving Day Parade.

SeaWorld worked with the Macy's Parade Studio, who constructs all the floats for the event, on the design of A Sea With Surprises. The units are built in New Jersey and are made to partially collapse to fit through the Lincoln Tunnel before the parade.

The parade, set to air on NBC at 9 a.m. on Nov. 28, will lead into SeaWorld's 50-year celebration that will be marked next year in theme parks in Orlando, San Diego and San Antonio.

"We hope this festive float represents the fun, inspiration and surprises that guests will find during a visit to SeaWorld,” said Jim Atchison, president and CEO of Orlando-based SeaWorld Parks & Entertainment.

The Macy's parade has longstanding relationships with Orlando parks. Walt Disney Co. first participated with a Mickey Mouse balloon in 1934 and has marked many milestones with special entries. Most recently, a "Sailor Mickey" balloon has appeared to celebrate the expansion of the Disney Cruise Line, and Pixar characters such as Buzz Lightyear and Muppets including Kermit the Frog have floated down New Yorks' Fifth Avenue.

For years, Universal Studios has hosted balloons from the event for its Macy's Holiday Parade, which begins in the theme park annually in December.